Metal-matrix composites (MMC) suffer from preferential corrosion because of their nonhomogeneous composition and structure. In particular, aluminum alloy matrix materials are very susceptible to corrosion when the dispersoid is a noble phase, such as SiC. This paper describes the influence of processing variables on the corrosion susceptibility of aluminum metal-matrix composites. A high extrusion ratio and a modified solution heat treatment have been shown to enhance the corrosion resistance of a powder metallurgy (PM) AA(1) 7091 Al alloy (20 vol%) SiC (p = particulate) composite significantly.

Subject
Materials, Corrosion rate, Extrusion, Silicon carbide, Density, Sodium chloride solution, Composites, Corrosion resistance, Aluminum alloys, Alloys, Solution heat treatment, Corrosion potential, Voids
National Association of Corrosion Engineers
1988
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